Tube end forming hand tool



May 22, 1956 G. E. KJELLBERG TUBE. END FORMING HAND TOOL Filed Dec. 12, 1952 IN VEN TOR.

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TUREEENDEQRMING HAINDWOOL George -E.--Kiellberg,-Lake Worth, Fla. ,Applicatipn December 12, 1952, seria No. 52$,64f/Q ac-minis. (ems-1 1s This invention relates to hand forming-tools, and more particularly is directed to tools for shaping and forming formed or restricted end section is not true in circular.

cross-section.

Accordingly, an object of this invention is to provide a hand tool which will form and restrict an end section of lead pipe with one impact blow.

Another object of this invention is to provide a hand tool of the class described that will form a lead pipe 2,746,325 Patented ma 22,1956

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body 3 has a cavity forming an inner circular wall 6, -"tapering'.-1.1'pwardly "and inwardly "from "the open end thereof; "and the cavity inner wall 6 "terminat s in 2. channel defined by the Wall 6, a horizontal ganhiilar'flat 's'eet'io'n or shoulder? gand an .inwardly and down ardly sloping fortapered Wall' S of a "downward projection 9, extending into the cavity and concentric flierewith.

A vertical concentriccylindrical recess 11 "is provided through the cylindrical 'projectionf9 into the 'boss 1 as "affurther ecqnnm inmarerial.

'The'cylindricalboss t may be provided with anfannu- 'lar projection 12 at the top end thereof, as .illustrate'din Fig. 4, as Ia hand protector. The boss "4 may 'also be providedwithahandle, having a y'clke14' with apertures T5 therein to receive a pivot pin 17 extending through the boss 4.

The hollow body 3 may be modified to provide a bellshaped interior wall 16, as illustrated in Fig. 4, to acsection and restrict the end section thereof in true circular cross-section.

Another object of this invention is to provide a hand tool of the class described that will be economical and simple in construction, and efficient, durable and accurate in use.

The foregoing and other objects and advantages will be more apparent from reading the following specification in conjunction with the drawings, forming a part thereof, wherein:

Fig. 1 is a perspective view of the end section of a length of lead pipe;

Fig. 2 is a. vertical cross-sectional view of the tool of this invention, with a pipe section partially shown in elevation;

Fig. 3 is an end view of the tool of this invention;

Fig. 4 is a cross-sectional view of a modification of the tool of this invention, parts shown in elevation; and,

Fig. 5 is a side elevation of the invention with handle embodiment added.

Referring to the drawings wherein like members are given the same reference numeral, a section of lead pipe 1 is generally represented having deformations 2 in the periphery thereof. The hand tool of this invention, which corrects the deformations and restricts the end to meet specification requirements, for fittings is formed of any suitable rigid material, such as wood, aluminum, brass and the like, in any suitable manner, such as turning,

spinning, casting and the like, depending on material employed. The preferred material and method is centrifugal cast aluminum. When a wooden tool is turned, it is desirable, if not essential, to turn the tool from a laminated block, in a conventional manner, toprevent splitting.

The tool has a hollow, open-end, cup-shaped body 3, preferably circular for economy of material consideration, having a vertically extending projection or boss 4, which is preferably cylindrical for economy of material and simplicity of construction. The hollow, open-end commodate extremely deformed pipe sections to be formed and restricted.

The preferred form of the invention is best illustrated in Fig. 3 in which all elements are concentric in plan view, top or bottom.

Certain details of construction become important in production, and others are more important in use. When the device is to be cast from metal, such as aluminum, it is desirable to have the vertical exterior and interior surfaces of the body 3 and projection boss 4 sloping outwardly and downwardly to facilitate removal from the mold. It is also desirable to have the top surface of the boss 4 substantially flat to receive direct impact blows of a mallet. This boss 4 should also be of sufiicient length to be firmly gripped by the hand or thumb and two fingers of the operator below the top of the boss to prevent possibility of smashed fingers.

When used with extremely deformed pipes the open end should be flared to bell-shape as illustrated at 16 in Fig. 4.

The circular interior wall 6 or 16 is preferably arcuately tapered upwardly, but straight line taper is satisfactory. The annular horizontal fiat section 7 should be at least the width of the pipe wall, and preferably slightly wider to permit slight tolerance and clearance.

When substantially true circular lead pipe is to be restricted the internal projection 9 could be eliminated as it functions principally as inside pipe former, but it is desirable. With deformed pipe sections, it is essential.

The open end of the body 3 of the tool should measure at least M: inch and preferably /2 inch greater inside diameter than outside diameter of pipe section to be restricted. The side wall 6 should terminate at the flat horizontal section Z in a reduced diameter desired. The sloping interior side wall 6 should have a length approximately equivalent to the radius of the horizontal circular cross-section thereof. As example, to form a 4 inch pipe for connection to a toilet, the tool should be at least 4% inches in interior diameter at the open end, 3 /3 inches in interior diameter at the junction of the side wall 6 and horizontal section 7, and have a 2 inch interior depth or length of the side wall. I

When the tool is formed of aluminum it is desirable to apply wax to the end of the pipe section before restricting. Since wax is used on the restricted end when capping, this procedure merely adds the wax earlier than normally done, and it facilitates removal of the restricted pipe section. When wooden tools are used, the wax need not be added to the pipe until ready for capping.

In use the device is quite simple and can be used by nnskilled labor. The tool is placed over the section of pipe, and the top of the boss 4 struck once with a mallet, thus driving the tool down on the pipe until the end of the pipeabuts the horizontal flat section 7. The wall 6 or 16 I Changes can be made therein Without departing from the spirit and scope of the invention, "as 'defined"in"'theiappended claims.

in true circular cross-section. i 9 helps form badly deformed 2; hand' forming-tool comprising a vertically disposed body, an open-end cavity in said body, said cavity having 'a' horizontal circular cross-section of upwardly Having thus described the invention,'wl1at is claimed is I 1. A hand forming-tool comprising a body, an' openend cavity in said body, said cavity having a circular crosssection of diminishing diameter from said open end to the closed end thereof, a tapered concentric projection extending into said cavity, said projection being of lesser depth thanthe circular Wall of the'cavity and said projection defining an annular channel with the wall of 'said cavity and a horizontal annular flat section joining the wall of the cavity to the base of the projection.

diminishing diameter, and a vertically extending tapered cylindrical projection on said body concentric with said cavity and of lesser extent than the circular wall of the cavity.

References Cited in the file of this patent UNITED STATES PATENTS 278,599 Robinson May 29, 1883 1,042,121 Kerrigan Oct. 22, 1912 1,341,163 Beste May 25, 1920 1,105,409 Mueller et a1. Aug. 19, 1924 

